1. IOR/Z/E/4/28/R819 Reference (shelfmark): IOR/Z/E/4/28/R819 Title: Riddell, H.P.A.B., Director General of Post Office, System of account framed by, for the prevention of fraud at Post Office Collection Area: India Office Records and Private Papers Languages: English Date Range: 1856-1857 Extent: 1 entry